Payback · Lisbon District · Portugal
Commercial solar payback in Loures: 4.0 years
A self-consuming 100 kWp array on a commercial roof in Loures typically pays back in about 4.0 years. That figure uses Loures's specific yield of 1,590 kWh per kWp per year and a commercial tariff near €0.20/kWh, with 70% of generation used on site.
At that yield the array produces about 159,000 kWh a year and saves roughly €22,260 annually against an installed cost near €90,000. Over 25 years the net saving is around €466,500, while avoiding about 55.6 tonnes of CO₂ each year.
Loures is in Lisbon District, alongside Lisbon, Sintra and Cascais. Those towns share the same irradiance zone, so payback is similar — the difference is which warehouses and factories still have empty roof. SolarScout lists them with a pre-computed business case rather than a generic "solar is cheap" pitch.
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Scan this area free →How the Loures payback number is calculated
Start with 100 kWp × 1,590 kWh/kWp = 159,000 kWh of annual production on a representative warehouse or factory roof in Loures. Apply 70% self-consumption against €0.20 per kWh and you get about €22,260 a year. Divide the €900/kWp installed cost (€90,000 for 100 kWp) by that saving and payback lands at 4.0 years.
This is a worked example, not a quote. Real payback moves with self-consumption, shading, export tariff and installed cost. It is still the right first filter: if a roof in Loures cannot beat roughly 4.0 years on these inputs, it is probably not a priority lead.
Loures versus the rest of Portugal
Relative to Portugal as a whole, payback in Loures is about 0.3 years faster than the Portugal average of 4.3 years. Portugal enjoys very high sunshine hours along the Atlantic coast and interior. Warehouses, factories and cold-storage sites achieve rapid payback from on-site solar self-consumption.
That is why outreach in Loures should open with the local number — 4.0 years and €22,260 a year on 100 kWp — not a national average that under- or over-sells the roof.
What actually changes payback on a Loures roof
Yield is already baked into the 1,590 kWh/kWp zone for Lisbon District. The bigger swings are usable roof area, daytime load (factories and cold stores self-consume more than empty warehouses) and whether the site pays the full €0.20/kWh commercial rate.
SolarScout estimates roof footprint from satellite and map data and, where Google Solar coverage exists, modelled annual output — so you can rank Loures sites by savings instead of guessing from a map pin.
Frequently asked questions
What is the commercial solar payback in Loures?
About 4.0 years for a self-consuming 100 kWp rooftop in Loures. That uses 1,590 kWh/kWp of local yield and a tariff near €0.20/kWh, saving around €22,260 a year.
How much electricity does 100 kWp produce in Loures?
Around 159,000 kWh a year. Multiply the 1,590 kWh/kWp specific yield for Lisbon District by 100 kWp; shading and orientation can move that figure, which is why SolarScout models each roof rather than stopping at the city average.
Is payback in Loures better than nearby towns?
Payback is in the same band as Lisbon, Sintra and Cascais because they share the Lisbon District irradiance zone. The practical difference is the stock of large, unshaded commercial roofs — SolarScout lists those in Loures with a pre-computed saving so you can compare sites, not just towns.